/*
 * Copyright 2015 The Netty Project
 *
 * The Netty Project licenses this file to you under the Apache License,
 * version 2.0 (the "License"); you may not use this file except in compliance
 * with the License. You may obtain a copy of the License at:
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations
 * under the License.
 */
package io.netty.buffer;

import io.netty.util.Recycler;
import io.netty.util.Recycler.Handle;
import io.netty.util.internal.PlatformDependent;

final class PooledUnsafeHeapByteBuf extends PooledHeapByteBuf {

  private static final Recycler<PooledUnsafeHeapByteBuf> RECYCLER = new Recycler<PooledUnsafeHeapByteBuf>() {
    @Override
    protected PooledUnsafeHeapByteBuf newObject(Handle<PooledUnsafeHeapByteBuf> handle) {
      return new PooledUnsafeHeapByteBuf(handle, 0);
    }
  };

  static PooledUnsafeHeapByteBuf newUnsafeInstance(int maxCapacity) {
    PooledUnsafeHeapByteBuf buf = RECYCLER.get();
    buf.reuse(maxCapacity);
    return buf;
  }

  private PooledUnsafeHeapByteBuf(Handle<PooledUnsafeHeapByteBuf> recyclerHandle, int maxCapacity) {
    super(recyclerHandle, maxCapacity);
  }

  @Override
  protected byte _getByte(int index) {
    return UnsafeByteBufUtil.getByte(memory, idx(index));
  }

  @Override
  protected short _getShort(int index) {
    return UnsafeByteBufUtil.getShort(memory, idx(index));
  }

  @Override
  protected short _getShortLE(int index) {
    return UnsafeByteBufUtil.getShortLE(memory, idx(index));
  }

  @Override
  protected int _getUnsignedMedium(int index) {
    return UnsafeByteBufUtil.getUnsignedMedium(memory, idx(index));
  }

  @Override
  protected int _getUnsignedMediumLE(int index) {
    return UnsafeByteBufUtil.getUnsignedMediumLE(memory, idx(index));
  }

  @Override
  protected int _getInt(int index) {
    return UnsafeByteBufUtil.getInt(memory, idx(index));
  }

  @Override
  protected int _getIntLE(int index) {
    return UnsafeByteBufUtil.getIntLE(memory, idx(index));
  }

  @Override
  protected long _getLong(int index) {
    return UnsafeByteBufUtil.getLong(memory, idx(index));
  }

  @Override
  protected long _getLongLE(int index) {
    return UnsafeByteBufUtil.getLongLE(memory, idx(index));
  }

  @Override
  protected void _setByte(int index, int value) {
    UnsafeByteBufUtil.setByte(memory, idx(index), value);
  }

  @Override
  protected void _setShort(int index, int value) {
    UnsafeByteBufUtil.setShort(memory, idx(index), value);
  }

  @Override
  protected void _setShortLE(int index, int value) {
    UnsafeByteBufUtil.setShortLE(memory, idx(index), value);
  }

  @Override
  protected void _setMedium(int index, int value) {
    UnsafeByteBufUtil.setMedium(memory, idx(index), value);
  }

  @Override
  protected void _setMediumLE(int index, int value) {
    UnsafeByteBufUtil.setMediumLE(memory, idx(index), value);
  }

  @Override
  protected void _setInt(int index, int value) {
    UnsafeByteBufUtil.setInt(memory, idx(index), value);
  }

  @Override
  protected void _setIntLE(int index, int value) {
    UnsafeByteBufUtil.setIntLE(memory, idx(index), value);
  }

  @Override
  protected void _setLong(int index, long value) {
    UnsafeByteBufUtil.setLong(memory, idx(index), value);
  }

  @Override
  protected void _setLongLE(int index, long value) {
    UnsafeByteBufUtil.setLongLE(memory, idx(index), value);
  }

  @Override
  public ByteBuf setZero(int index, int length) {
    if (PlatformDependent.javaVersion() >= 7) {
      checkIndex(index, length);
      // Only do on java7+ as the needed Unsafe call was only added there.
      UnsafeByteBufUtil.setZero(memory, idx(index), length);
      return this;
    }
    return super.setZero(index, length);
  }

  @Override
  public ByteBuf writeZero(int length) {
    if (PlatformDependent.javaVersion() >= 7) {
      // Only do on java7+ as the needed Unsafe call was only added there.
      ensureWritable(length);
      int wIndex = writerIndex;
      UnsafeByteBufUtil.setZero(memory, idx(wIndex), length);
      writerIndex = wIndex + length;
      return this;
    }
    return super.writeZero(length);
  }

  @Override
  @Deprecated
  protected SwappedByteBuf newSwappedByteBuf() {
    if (PlatformDependent.isUnaligned()) {
      // Only use if unaligned access is supported otherwise there is no gain.
      return new UnsafeHeapSwappedByteBuf(this);
    }
    return super.newSwappedByteBuf();
  }
}
